Cardiotocography is a method of assessing the fetal heart rate and uterine contractions simultaneously. It provides important information about the baby's response to the uterine environment and any potential signs of distress. CTG is typically performed during the third trimester of pregnancy to monitor fetal well-being, especially in high-risk pregnancies or situations where there are concerns about the baby's health.

1. Preparation: The healthcare provider explains the procedure to the expectant mother and ensures her comfort during the test. The woman is positioned comfortably on her back or side, depending on gestational age and individual comfort.

2. Application of Transducers: Two transducers are placed on the woman's abdomen. The first transducer, the ultrasound transducer, is positioned over the area where the fetal heart rate is best heard. The second transducer, the toco transducer, is placed over the fundus of the uterus to measure uterine contractions.

3. Monitoring: The CTG machine records the fetal heart rate and uterine contractions continuously for a specific duration, usually 20-30 minutes. The machine produces a graph (trace) that shows the changes in fetal heart rate and uterine contractions over time.

4. Interpretation: The CTG trace is analyzed by the healthcare provider to assess fetal well-being. They examine various parameters, including baseline fetal heart rate, variability, accelerations, decelerations, and the relationship between fetal heart rate and contractions.

5. Assessment of Variability and Patterns: Variability refers to the normal fluctuations in the fetal heart rate, which indicates a healthy nervous system. Patterns, such as accelerations (temporary increases in heart rate) and decelerations (temporary decreases in heart rate), are also evaluated for normalcy.

6. Non-Reactive Traces: If the CTG trace shows no significant variability or abnormal patterns, it is considered non-reactive. Further assessment or additional tests may be necessary to evaluate fetal well-being more closely.

7. Documentation and Communication: The findings of the CTG monitoring are documented in the woman's medical records, and the results are communicated to the woman and her healthcare team. Further actions, such as additional testing, changes in management, or further monitoring, may be recommended based on the CTG findings.